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Allow changes to be saved even when ticket has been modified

Description

A plugin that replaces the default trac ticket validation with a version that, after showing you the warning (Warning: Sorry, can not save your changes. This ticket has been modified by someone else since you started), allows you to save anyway.

The vast majority of times this error is signaled, both changes are additive and can be safely applied so lets not force people to jump through hoops unnecessarily.